What quantity should be added to both sides of this equation to complete the square? x^2 - 8x = 5

A. 16
B. 4
C. -16
D. -4

What is the area of a pizza with a radius of 40 cm leave the answer in terms of π to find your exact answer 40π cm² 1600π cm² 800π cm² 80π cm² π=pi

Could somebody me with this radical simplification?

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.